A certain oxide of iron contains 2.5 grams of oxide for every 7.0grams of iron. If it is regarded as a mixture of FeO and Fe_(2)O_(3) in the weight ratio a:b, what is a:b ? (atomic weight of iron = 56)

A certain oxide of iron contains 2.5 grams of oxide for every 7.0grams

1.	A certain oxide of iron contains 2.5 grams of oxide for every 7.0grams of iron. If it is regarded as a mixture of FeO and Fe_(2)O_(3) in the weight ratio a:b, what is a:b ? (atomic weight of iron = 56)
Answer» `9:10` `9:20` `14:5` `1:1` ANSWER :A